Yr Eifl rises sharply from the north coast of the Llŷn Peninsula. This iconic mountain comprises 3 peaks, Tre'r Ceiri (485m), Garn Ganol (564m) and Garn For (444m). Along with a strong cultural resonance, Yr Eifl excites special interest due to its plant life and birds.
On the third summit of Yr Eifl, stands the ancient hill fort of Tre’r Ceiri, meaning 'Town of the Giants’. This spectacular remnant of an Iron Age hill fort is said to be one of the most impressive monuments in Wales. Stone ramparts surround its entire circuit and in some places exceed 3m in height. The interior is packed with walled stone buildings and the remains of 150 huts, with some walls over a metre high. Several are roundhouses and others are rectangular and oval. The huts are grouped together in four or five bands across the fort, varying in size and shape.
Galvanising views extend from Cumbria to Wicklow and across Cardigan Bay. Habitats encompass the rocky shoreline, quarries, natural outcrops, screes, extensive heathland and exposed summit areas. Heather, Bell Heather and Western Gorse dominate the drier heath, while Cross-leaved Heath, Deergrass, Purple Moor-grass and Bog Moss are abundant in the wetter areas. Butterwort and Common Yellow-sedge occur in wet flushes where soils are less acidic. The seaward face of the northern peak is a steep gullied slope down to sea level.
The population of Chough, which breed on the natural and artificial rock faces and feed on the heaths, rouse particular interest. Other birds include Buzzard, Meadow Pipit, Raven and Wheatear (summer visitor). A herd of feral goats are also residents of the area.
Parking is available at the Porth-Y-Nant upper car park, above the village of Nant Gwrtheyrn.